Efficiency is one of the most important specifications when choosing a 6.6kW solar system. An efficient system generates more electricity from every hour of sunshine, delivering better financial returns and faster payback.
Understanding Solar Panel Efficiency
Modern high-efficiency panels typically achieve 20–23% efficiency. A 415W panel at 22% efficiency generates 12% more output per panel than a 370W panel — meaning more energy from the same roof space and more savings on your bill.
System-Level Efficiency
Whole-system efficiency encompasses panel efficiency, inverter performance, cable losses, and design quality. A well-designed system delivers 85–90%+ of theoretical maximum generation — versus 70–80% for a poorly designed system.
Efficiency and Heat: The Temperature Coefficient
In New Zealand's warm climate, a low temperature coefficient is particularly important — meaning the panel loses less performance on hot days, keeping your system efficient through summer when you need it most.
Contact EFS Solar for a free efficiency analysis and quote for your home.